Electrostatic force on a charged parricle is given by `overset(.)F=qvec(E)`. If q is positive `vec(F)uarrrArrvec(E)uarr` and if q negative `vec(F) uarr rArr vec(E ) darr`
Question : In the figure `m_(A) = m_(B) =1kg`. Block A is neutral while `q_(B) = - 1C`. Sizes of A and B are negligible. B is relased from rest at a distance 1.8 m from A. Initially spring is neither compressed nor elongated

If cllision between A and B is perfectly inlastic, what is velocity of combined mass just after collision ?

Options

A. 6 m/s
B. 3 m/s
C. 9 m/s
D. 12 m/s

Answer

B